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Gradients of microstructure and diffusion properties in cement paste caused by drying

✍ Scribed by R.G. Patel; L.J. Parrott; J.A. Martin; D.C. Killoh

Publisher
Elsevier Science
Year
1985
Tongue
English
Weight
588 KB
Volume
15
Category
Article
ISSN
0008-8846

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✦ Synopsis

This paper demonstrates that the microstructure of hydrated cement paste varies with distance from an exposed, drying face. Supporting measurements of cement hydration, adsorption capacity, porosity and diffusion rate are reported for an ordinary Portland cement and an ordinary Portland/pulverised fuel ash blended cement at ages of 28 and 163 days. Possible causes of the microstructural gradients are discussed in relation to the effects of a) moisture condition upon cement hydration and pore structure changes and b) carbon dioxide upon cement hydrates and porosity. The practical implications of microstructural gradients are discussed with particular reference to the region immediately below the exposed surface.

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